There are _______ people in the shopping center.
| A．hundred | B．hundreds | C．3 hundreds | D．hundreds of |
It is important _______ us _______ learn English well.
| A．for; to | B．to; to | C．for; in | D．to; in |
Both his sister and his brother _______ basketball players.
| A．is | B．am | C．are | D．be |
I’m not good at English, but I keep _______ hard.
| A．study | B．to study | C．studying | D．studies |
Running every day _______ me very healthy.
| A．makes | B．make | C．to make | D．making |